This is a masked input plugin for the jQuery javascript library. It allows a
user to more easily enter fixed width input where you would like them to enter
the data in a certain format (dates,phone numbers, etc). It has been tested on
Internet Explorer 6/7, Firefox 1.5/2/3, Safari, Opera, and Chrome. A mask is
defined by a format made up of mask literals and mask definitions. Any
character not in the definitions list below is considered a mask literal. Mask
literals will be automatically entered for the user as they type and will not
be able to be removed by the user.